Material type: suction cup 30mm or adhesive surface 20mm | Size: 4 pieces DIYexpert suction cup in 16mm or 20mm or 30mm or 40mm with adhesive surface or adhesive plate transparent - suction cup with double-sided adhesive pad Can be used quickly and universally. Strong hold thanks to the soft PVC suction cup. Installation on smooth surfaces. Please clean carefully beforehand. Application examples: and Sign hanging of all kinds: office signs, signs in the bus, advertising posters and In the mobile home: for attaching light objects and In the kitchen or bathroom: for attaching decorations | What's your idea Easy to understand, elegant, durable and innovative: This is what distinguishes products from the DIYexpert brand. Become a do-it-yourself expert. Self-made makes you happy and saves money. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.